Kimyai Soodabeh, Mohammadi Narmin, Navimipour Elmira Jafari, Rikhtegaran Sahand
Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
Photomed Laser Surg. 2010 Oct;28 Suppl 2:S25-30. doi: 10.1089/pho.2009.2598.
This study compared the effects of three mechanical surface treatments, including diamond bur, air-abrasion, and Er, Cr: YSGG laser on the repair bond strength of a laboratory composite resin.
A proper bonding must be created between the existing composite and the new one for successful repair.
Sixty cylindrical specimens of a laboratory composite resin (Gradia) were prepared and randomly divided into four groups (n = 15). Groups 2-4 were treated with diamond bur, air-abrasion, and Er, Cr: YSGG laser, respectively; group 1 was the control group, without any mechanical surface treatment. The topographical effects of different mechanical surface treatments were characterized by atomic force microscope. Silane and a bonding agent (Single Bond) were used in all of the groups before adding a direct resin composite. Then, the specimens were subjected to a shear bond strength test. Failure modes were evaluated under a stereomicroscope. All data were analyzed by one-way ANOVA and Tukey test at a significance level of p < 0.05.
There were statistically significant differences in bond strengths between the groups (p < 0.0005). Differences in bond strengths between group 1 and the other groups were significant (p < 0.0005). Furthermore, there were significant differences in bond strengths between group 2 and groups 3 and 4 (p < 0.0005), while the bond strength differences between groups 3 and 4 were not significant.
Based on the results of this study, Er, Cr: YSGG laser was confirmed to be as effective as air-abrasion for laboratory composite repair.
本研究比较了三种机械表面处理方法，即金刚石车针、空气喷砂和铒铬：钇钪镓石榴石（Er, Cr: YSGG）激光对实验室复合树脂修复粘结强度的影响。
为成功修复，必须在现有复合材料与新复合材料之间建立适当的粘结。
制备60个实验室复合树脂（Gradia）圆柱形试件，并随机分为四组（n = 15）。第2 - 4组分别用金刚石车针、空气喷砂和Er, Cr: YSGG激光处理；第1组为对照组，未进行任何机械表面处理。用原子力显微镜表征不同机械表面处理的形貌效应。在添加直接树脂复合材料之前，所有组均使用硅烷和粘结剂（单键粘结剂）。然后，对试件进行剪切粘结强度测试。在立体显微镜下评估失效模式。所有数据采用单因素方差分析和Tukey检验进行分析，显著性水平为p < 0.05。
各组间粘结强度存在统计学显著差异（p < 0.0005）。第1组与其他组之间的粘结强度差异显著（p < 0.0005）。此外，第2组与第3组和第4组之间的粘结强度存在显著差异（p < 0.0005），而第3组和第4组之间的粘结强度差异不显著。
基于本研究结果，证实Er, Cr: YSGG激光在实验室复合树脂修复方面与空气喷砂效果相当。
